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V8 thermostats fitted in the hose connection on the outlet from the head-held in place by the hose-heater connection was at bottom of the outlet stub.
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Anything is possible with motor vehicles.
Theory: it was cool weather. The first thermostats were stuck open. The replacements also immediately stuck open. The cardboard worked as long as the weather remained cool and the truck kept moving. One day it got warmer or the truck had to sit in a traffic jam, so it overheated at last.
A rogue batch of thermostats. They're pretty cheap and random components usually.
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Either that or for some reason they were fitting the wrong thermostats. That can happen too.
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Ah the joys of a stuck-open thermostat, last year I think it was I had been to see a friend in Worthing travelling in my much abused WORKING Land Rover Defender Diesel, a petrol tanker had gone over on the M25, of course had to find a different way round, stuck in traffic in cool weather with a cold-running engine. Brilliant. The heater output was so pathetic I decided the engine needed the heat more than I did so switched it off..Glad to get home (North Essex) I can tell you! One new thermostat later it was back to its usual performance, not as bad as some people will lead you to believe!!
John Deere tractor engines also sometimes have two thermostats.
In my experience wax type thermostats stick open, am I right in thinking the old bellows type often did the opposite?
James.
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